It started as a student exercise, the knife under the drape, the model's pose chalked in place. But before Agatha Troy, artist and instructor, returns to the class, the pose has been re-enacted in earnest: the model is dead, fixed for ever in one of the most dramatic poses Troy has ever seen. It's a difficult case for Chief Detective Inspector Alleyn. How can he believe that the woman he loves is a murderess? And yet no one can be above suspicion.